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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dea7589f57d00ac69eb94e1d1df6a74a436121ba04b2dc4d3056e2b17714f71f' 
  AND token = 'LDmd1eXilkMaGBK3E5M+tJpKEkcHAYSzbyQKLdLmpoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}